1 Traditional Medicine Institute of Ho Chi Minh City, Ho Chi Minh City, Vietnam.
2 Department of Training, Scientific Researching, Health Activities Direction, Traditional Medicine Institute of Ho Chi Minh City, Ho Chi Minh City, Vietnam.
3 General Medicine Department, Traditional Medicine Institute of Ho Chi Minh City, Ho Chi Minh City, Vietnam.
4 Department of Medical Statistics and Informatics, Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam.